T-Symphony Fix

Play sound from your TCL TV speakers and any eARC soundbar at the same time, and line them up with an adjustable speaker delay.

Unofficial, not affiliated with TCL. Tested on one TCL Smart TV Pro (Android TV 12, MediaTek) with a TCL Q75H soundbar. Other models or firmware may not have this feature. Use at your own risk.

What it does

• Turns on the TV's built-in T-Symphony mode (TV speakers + soundbar together) for any eARC soundbar, not only TCL-certified ones.
• Delays the TV speakers so they stay in sync with the soundbar. Default 50 ms, adjustable with the remote.
• Turns it back on when the TV resets it (soundbar reconnect, screen off/on).

Install (one time, needs a computer with adb)

1. On the TV: Settings → System (or Device Preferences) → About, press Build 7 times. Then open Developer options and enable USB debugging / network debugging. Note the TV's IP address.
2. On the computer, connect and allow the prompt on the TV:

   adb connect TV_IP:5555

3. Install the app:

   adb install tsymfix.apk

4. Allow it to switch T-Symphony on (required):

   adb shell pm grant local.tsymfix android.permission.WRITE_SECURE_SETTINGS

5. Open T-Symphony Fix from the TV's app list.

Use

• −10 / −5 / +5 / +10 ms: if the TV speakers sound ahead of the soundbar, increase the delay; if they lag, decrease it.
• Service: on / off: off returns the TV to stock behaviour (soundbar only, no delay).
• Language: English, Ukrainian, Russian.

Notes

• After a full reboot, if the TV speakers stay silent, open the app once. Some TVs block apps from starting on boot.
• To uninstall, set Service: off first, then adb uninstall local.tsymfix.